Note that the UI language used at any given time is determined by the Windows Multiple Language Interface (MUI) setting, as it is for Internet Explorer (the host application). If the Windows MUI language has not been installed, the UI language will default to English. This can be confusing at times. For example: If you installed the Japanese version of the Visio Viewer on an English Windows system and MUI for that system is not set to Japanese, the Viewer UI will be English, as will the UI in Internet Explorer.

To suppress the End User License Agreement and to associate Visio Viewer with the .vsd, .vss, .vst, .vdx, .vsx and .vtx file types, add the following rows to the Property table of vviewer.msi (using Orca, for example):

ACCEPTEULA 1
ASSOCIATE 1

Thanks very much to yipperz, who suggested this solution for the 2003 version of Visio Viewer. It works in the exact same way for Visio Viewer 2007.